Cirrus Logic Inc.

Cirrus Logic International Semiconductor Limited

Robert James Hatfield

John Paul Lesso

Michael Page

John Laurence Pennock

Robert David Rand

Gordon Richard McLeod

Rohit Tomar

Sunil Saunders

Aadilhussain Maniyar

Peter J Tonge

Circuitry for processing an input signal from a sensor, the circuitry comprising: an input configured to receive the input signal; bias circuitry configured to apply a bias to the input signal to obtain a biased input signal; a gain stage configured to apply a gain to the biased input signal to obtain an amplified input signal; an analog-to-digital converter (ADC) configured to convert the amplified input signal to a digital output signal; wherein, during a calibration phase, the control circuitry is configured to: control the bias circuitry to apply a macro offset to the input signal, the macro offset to bring the amplified input signal within a dynamic range of the ADC; and determine a micro offset to be applied during a measurement phase of the sensor based on the macro offset and the digital output signal; and wherein during the measurement phase, the control circuitry is configured to control the bias circuitry to disable application of the macro offset and apply the micro offset to the input signal, the macro offset having a greater magnitude than the micro offset.

Methods and circuitry for calibration

A speech recognition system comprises: an input, for receiving an input signal from at least one microphone; a first buffer, for storing the input signal; a noise reduction block, for receiving the input signal and generating a noise reduced input signal; a speech recognition engine, for receiving either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block; and a selection circuit for directing either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block to the speech recognition engine.

Speech recognition

An audio apparatus is described for communicating with a user device, the audio apparatus comprising: a sensor configured to sense a user input and to generate an input signal representing the user input; and electronic circuitry operable to receive the input signal. The electronic circuitry is configured to: process the input signal, and generate a control signal for controlling at least one switch based on the input signal.

Audio apparatus, sensor module and user device

Received data representing speech is stored, and a trigger detection block detects a presence of data representing a trigger phrase in the received data. In response, a first part of the stored data representing at least a part of the trigger phrase is supplied to an adaptive speech enhancement block, which is trained on the first part of the stored data to derive adapted parameters for the speech enhancement block. A second part of the stored data, overlapping with the first part of the stored data, is supplied to the adaptive speech enhancement block operating with said adapted parameters, to form enhanced stored data. A second trigger phrase detection block detects the presence of data representing the trigger phrase in the enhanced stored data. In response, enhanced speech data are output from the speech enhancement block for further processing, such as speech recognition.

Voice command triggered speech enhancement

An electronic device, comprising one or more input devices, for receiving biometric input from a user and generating one or more biometric input signals; an applications processor; a mixer configurable by the applications processor to provide a first signal path between one or more of the input devices and the applications processor; and a biometric authentication module coupled to the one or more input devices via a second signal path that does not include the mixer, for performing authentication of at least one of the one or more biometric input signals.

Methods and apparatus for authentication in an electronic device

A method for determining the presence of unwanted signal components in an acoustic signal, comprises: receiving a first microphone signal derived from an acoustic signal, applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output, receiving a second microphone signal derived from the acoustic signal, applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output, wherein the second transfer function has a different degree of linearity from the first transfer function, and determining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output.

Detecting unwanted audio signal components by comparing signals processed with differing linearity

The present invention relates to methods and apparatus for data transfer. A data interface is described with at least a first data terminal for either outputting or receiving a data signal. In bi-directional embodiments there may be one terminal for receiving data and one terminal for outputting data. A bit clock terminal outputs or receives a bit clock signal; and a frame clock terminal for outputs or receives a frame clock signal. Interface control circuitry is configurable to associate data outputted or received in each frame with time slots (1-8) of a predetermined number of bits (x, y, z) wherein the control circuitry is adapted such that the frequency of the bit clock signal can be changed at any time so as to vary the number of time slots in a frame.

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Edinburgh, United Kingdom

Robert James Hatfield